book Maths Puzzle Numerical Ability

I need help with these problems. They are to solved using an appropriate algebraic method.

25. 10i - 27v = -4
40i + 33v = 69

27. 7x = 2y - 6
7y = 12 - 4x

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book Other Question

Fixed operating costs at a ball bearing plant is $2000 per day. Each worker created $500 worth of ball bearings in a day, but costs the company $300 per day in wages and benefit. Five people want to share a square pizza. The first person (who is really hungry) removes a quarter of the pie. When the others find out, they are annoyed and try to divide the r